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Most use foam and some use the expanding foam for filling it. It all needs to be coated with several layers of cement and in the last couple of coats, cement dye. There are several ways to do backgrounds on the internet. I was looking into doing it once myself.

Here are some directions to making a background I made. I've listed the things to use. I've made over 20 backgrounds this way for people. We all still have them in our tanks with no issues to the fish.

Most use foam and some use the expanding foam for filling it. It all needs to be coated with several layers of cement and in the last couple of coats, cement dye. There are several ways to do backgrounds on the internet. I was looking into doing it once myself.

what happens if instead of covering jablo with cement, one simply covers it with stones and silicone?

just few seconds ago i was reading this link. just check it out and tell me what you think, guys!

cheers

Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.

Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.